Mike Cosper is one of the founding pastors of Sojourn Community Church in Louisville, Kentucky, where he serves as the pastor of worship and arts. He is the founder of Sojourn Music and contributes regularly to the Gospel Coalition blog, where he writes about worship and culture. He is the author of Rhythms of Grace and The Stories We Tell and coauthor of Faithmapping.
Timothy Keller is founder and pastor of Redeemer Presbyterian Church in New York. He is the best-selling author of The Prodigal God and The Reason for God.
Collin Hansen is editorial director for The Gospel Coalition and was previously an associate editor for Christianity Today. He has written for Books & Culture, Leadership, and Christian History & Biography, and is the author of Young, Restless, and Reformed.